Counting duplicates

There is likely a very simple solution to this but I haven't been able to come up with an answer. I have a long list of names which sometimes occur more than once. I need to tally the names that DO appear 2 or more times and count how many times they appear. Something like this:

george
mary
bob
bob
mary
greg
bob
bob 3
mary 2

Any help on this would be really appreciated!